John booth



(No Model.)

J. BOOTH.

BALANCED SLIDE VALVE. No. 355,432. Patented Jan. 4,1887.

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n. PETERS. Plwlo-Lmw m hur. Waxhinglom D. C.

UNITED STATES PATENT QF-FICE.

JOHN BOOTH, OF INDIANAPOLIS, INDIANA.

SPECIFICATION forming part of Letters Patent No. 355,432, dated January4, 1887.

BALANCED SLIDE-VALVE.

Application filed September 4, 1886. S erial No. 212.74%. (No model.)

consequent on the difference of pressure between the back of the valveand the cavity of the exhaust, and will be understood from the followingdescription.

In the drawings, Figure 1 represents a top view of my device, the top ofthe steam-chest being removed, showing the interior arrangement of theparts. Fig. 2 is a horizontal section thereof. Fig. 3 is a top view ofthe yoke and a part of the valve-rod. Fig. 4 is aside view of the same.a

In detail, ch represents the steam-chest; r,

the valve-rod, which passes through the usual gland, 91, and boxing b,and is connected with the frontend of the valve by means of the yoke 3attached to the inner end of the valve-rod.

The valve itself is double, and the separate parts are constructedsubstantially like the single valve shown in Letters Patent No.

' 339,7 34, issued to me April 13, 1886, to which reference is made fora more particular description thereof. The present valve only differsfrom'that in being double, the two parts being connected together by abridge-piece, through which is an opening leading from theexhaust-cavity in one to the exhaust-cavity in the other valve,practically making a continuvalve has a groove extending around itswalls or frame-work, in which are placed springs s,- packing-frames pf,elastic or soft metal packing 1;, and the equalizing-frames ef, asdescribed in my former patent, so that the pressure of the steam willcompress the packing material, and the steam cannot escape beyond theequalizing-frame, and it will force it outward against the steam-chestcover t, thereby making the upward pressed surface of the frame equal tothe downward-pressed surface of the valve. ljhe shape of these valves isnot material so long as the proper arrangement of the parts is preservedand the proper dimens'ions considered.

It is not intended in this patent to claim the arrangement of theequalizing-frame, the packing and springs in a single valve, for such relates to the subject-matter of the former patent issued to me.

My invention herein consists in extending \the principle of the singlevalve to a double valve, and providing an opening connecting theexhaust-cavities of the two single valves under a bridge, ashereinbeforedescribed. lhis principle of union is also applicable to the ordinarydouble slide-valve, provided the exhaust-cavity of each is connected byan opening from one valve to the other, as herein shown and described.

This valve is connected to the valve-rod by means of the yoke which hasprojections or lugs Z on the inner end of its arms, and'this yoke isdropped down over the front portion of the valve in such manner that thelugs on the valve, and by means of this yoke-connection, which isprovided with a threaded socket to receive the end of the valve-rod, thewhole valve is moved. By this arrangement I put the strain upon theshort armsof the yoke, which enter the recesses in the lugs connectedwith the valve-fran1e,whilein ordinary valves the rod passes through andover the exhaustcavity, thus cutting off its area and cramping I theexhaust of the engine, while my device relieves the exhaust-cavity fromany such diminution by the valve-rod. On an ordinary double slide-valvethe yoke passes clear around or through both parts of the valve, but bythis arrangement I avoid placing the yoke entirely around both sectionsof the valve, and at the ICC same time I make as secure and yet a moreing removable tops resting upon packing supsimple connection between thevalve-rod and ported by springs in grooves in the walls of the valveitself. the valve, with an opening connecting the ex- 15 What I claim asmy invention, and desire to haust-cavities of each, all combinedsubstan- 5 secure by Letters Patent, is the following: tially asdescribed.

1. A slide-valve provided withlngs I, re- In witness whereof I havehereunto set my cessed to admit the arms of the open yoke y, hand this31st day of August, 1886. which fits over the front portion of thevalve, 1 T such yoke connected with the valve-rod r, for JOHL BOOTH O.P. JACOBS, HATTIE MURRY.

described.

IO operating the sa1ne,substantially as shown and Vitnesses:

. 2. A double slide-valve, each portion hav- 1

